viewsonic VG2021m Flashing Blue power LED no image

[Medlock]

Hello and Greetings,

I have a VG2021 monitor that was working fine until when coming out of standby (amber LED) it went to a dim flashing blue LED and no image. I have since replaced ALL Caps even though the 3x 220uf 25v 105's were only buldging, but have the same exact problem. I have used a DMM to check the +5 and +12 pins on the connector between the boards (power invert removed and benched) and Have 4.78 and 11.87 respectivly. I purchased the Cap kit from LCDalternatives and all are rubys. I have 21.2 volts across the main fuse (F200) of the DAC-12m033af REV 02a PCB. All connectors have been checked, No visable scorching. I have heard a 'chirping' coming from IEC? marked MP-1301 DCGM 0645 that coincides with the flashing LED. I have ordered a complete Power/inverter but was wondering in the meantime if you folks would have any other ideas.
Thanks for your time
Joe

[Medlock]

Re: viewsonic VG2021m Flashing Blue power LED no image

Ok Folks This is where i really could use your help.
After purchasing the cap kit from the above mentioned co., They did not solve my problem, the folks there suggested that you all were the people to contact if I needed experienced help in the matters of LCD monitors.

Ok as you have read I replaced all the caps in the first power board and was left with the same problem. I purchased a complete board and the problem remains. The symptoms are as follows:

With the first power board before replacing any caps
Amber standby went to flashing dim blue power LED when coming out of standby.
No OSD No image when connected to computer.

After replacing all caps (except large 150uf 400v):
Same flashing blue LED except it was brighter
Blue LED is on IMMEDIATLY when power plug is inserted
Chirping was heard at the component (coinsiding with flash of LED) marked
2804793700
E115982 MP-1301
DCGM 0645
No OSD No image when connected to computer.

After inserting the new power board:
Same Blue flashing bright LED Immediatly when plugging in power cord(sigh)
Audible popping sound coming from internal speakers coinsiding with flash of LED (cannot hear the chirp)\No OSD No image.

I did not have the protective metal cages that cover the boards on at this time. Just the boards mounted with all screws inserted and monitor supported by a wooden holder. -2 1x1's horizontal to surface of bench.
Thats it guys, other than disconnecting all connectors and reinserting them and checking all PCB's for anything obvious thats all I can think of doing.

Pictures can be submitted if need be, but I think they would be of little use at this point. Let me know if you would prefer to see them.

power PCB Part # 12m033af rev 02a on both boards
Chi Mei LCD Model A201P1
Viewsonic VG2021m Bought 2005 Very light work as a Digital graphics and video editing computers monitor. Always off when not in use.

Again Thanks for your time
Joe

[alexanna]

Re: viewsonic VG2021m Flashing Blue power LED no image

Unless you have two bad Inv/PS,There’s three things left.
I would start by removing the Ribbon cable from signal board to the LCD panel,Dose the behavior of the PLED change?
Next unplug the Front panel switch from the signal board; you will not have a front PLED but do you get any indication that the back lights trying to come on.
Or there may be a problem with the signal board.
Pictures of the signal board will be needed, close up and in focus as close to 2000x2000 pixels as possible showing the entire board, using managed attachments.

As a side note, this thread could easily be missed,for the members that concentrate mostly on the monitor section

[Medlock]

Re: viewsonic VG2021m Flashing Blue power LED no image

thread moved to computer displays